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Free Download Manager site redirected Linux users to malware for years
(www.bleepingcomputer.com)
this post was submitted on 12 Sep 2023
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FDM does some clever things to boost download speeds. It splits up a download into different chuncks, and somehow downloads them concurrently. It makes a big difference for large files (for example, Linux ISOs).
I guess many servers are capping speeds them. Makes sense since I almost never see downloads actually take advantage of my Gigabit internet speeds.
It could make multiple requests to the server, asking each request to resume starting at a certain byte.
The key thing to know is that a client can do an HTTP
HEADrequest to get just theContent-Lengthof the file, and then performGETrequests with theRangerequest header to fetch a specific chunk of a file.This mechanism was introduced in HTTP 1.1 (byte-serving).